1 files changed, 84 insertions, 0 deletions
diff --git a/sdk/src/java/cyanogenmod/weather/util/WeatherUtils.java b/sdk/src/java/cyanogenmod/weather/util/WeatherUtils.java
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+++ b/sdk/src/java/cyanogenmod/weather/util/WeatherUtils.java
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+/*
+ * Copyright (C) 2016 The CyanogenMod Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package cyanogenmod.weather.util;
+
+
+import cyanogenmod.providers.WeatherContract;
+
+import java.text.DecimalFormat;
+
+/**
+ * Helper class to perform operations and formatting of weather data
+ */
+public class WeatherUtils {
+
+    /**
+     * Converts a temperature expressed in degrees Celsius to degrees Fahrenheit
+     * @param celsius temperature in Celsius
+     * @return the temperature in degrees Fahrenheit
+     */
+    public static float celsiusToFahrenheit(float celsius) {
+        return ((celsius * (9f/5f)) + 32f);
+    }
+
+    /**
+     * Converts a temperature expressed in degrees Fahrenheit to degrees Celsius
+     * @param fahrenheit temperature in Fahrenheit
+     * @return the temperature in degrees Celsius
+     */
+    public static float fahrenheitToCelsius(float fahrenheit) {
+        return  ((fahrenheit - 32f) * (5f/9f));
+    }
+
+    /**
+     * Returns a string representation of the temperature and unit supplied. The temperature value
+     * will be half-even rounded.
+     * @param temperature the temperature value
+     * @param tempUnit A valid {@link WeatherContract.WeatherColumns.TempUnit}
+     * @return A string with the format XX&deg;F or XX&deg;C (where XX is the temperature)
+     * depending on the temperature unit that was provided or null if an invalid unit is supplied
+     */
+    public static String formatTemperature(float temperature, int tempUnit) {
+        if (!isValidTempUnit(tempUnit)) return null;
+        if (Float.isNaN(temperature)) return "-";
+
+        DecimalFormat noDigitsFormat = new DecimalFormat("0");
+        String noDigitsTemp = noDigitsFormat.format(temperature);
+        if (noDigitsTemp.equals("-0")) {
+            noDigitsTemp = "0";
+        }
+
+        StringBuilder formatted = new StringBuilder()
+                .append(noDigitsTemp).append("\u00b0");
+        if (tempUnit == WeatherContract.WeatherColumns.TempUnit.CELSIUS) {
+            formatted.append("C");
+        } else if (tempUnit == WeatherContract.WeatherColumns.TempUnit.FAHRENHEIT) {
+            formatted.append("F");
+        }
+        return formatted.toString();
+    }
+
+    private static boolean isValidTempUnit(int unit) {
+        switch (unit) {
+            case WeatherContract.WeatherColumns.TempUnit.CELSIUS:
+            case WeatherContract.WeatherColumns.TempUnit.FAHRENHEIT:
+                return true;
+            default:
+                return false;
+        }
+    }
+}